Ultimate Category Excluder

Hi,

on my website (http://blogmd.netai.net) I am using a plugin called “Ultimate Category Excluder” (http://www.planetmike.com/plugins/ultimate-category-excluder/)

The plugin does it’s job properly but comes with a side-effect. When the plugin is activated i’m getting blank pages when clicking a category (for example: http://www.blogmd.netai.net/?cat=3 ).

All my posts are there, the archive is working, the blog works fine. It’s just the category-pages that fail.

Any ideas on this?